Git commits in Moodle 2.6.0 by Amy Groshek

commit dc3337b273b4785b670d75174d2570f3e8c0b22f
Author: Amy Groshek <amygroshek@gmail.com>
Date:   Fri, 25 Jan 2013 06:15:12 +0800
Tag:    v2.6.0-beta

MDL-37674 - modify html_attributes() to add .no-header class when header will not be rendered